import java.util.Scanner;

/**
 * 1. 英文字母
 * https://www.lanqiao.cn/problems/2379/learning/?page=1&first_category_id=1&second_category_id=3&tag_relation=intersection&tags=%E7%9C%81%E8%B5%9B,2022&sort=pass_rate&asc=0
 */
public class Main1 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        //在此输入您的代码...
        int n = scan.nextInt();

        char ch = (char) (n - 1 + 'A');
        System.out.println(ch);
        scan.close();
    }
}
